In other fossil-bearing sites west of Lake Turkana, several other species of hominins have been found, including Kenyanthropus platyops (3.2 mya), which has facial traits similar to those of the controversial 1.9-million-year-old H. habilis skull KNM-ER 1470—a skull that in some ways resembles Australopithecus. In sediments from 2.5 mya comes the “Black Skull” belonging to the robust australopith P. aethiopicus. In later beds occur representatives of P. boisei (2.3–1.6 mya), H. habilis (c. 2 mya), and H. ergaster/erectus (1.6 mya), including a nearly complete skeleton of an 11–13-year-old male called “Turkana Boy.” A 1.44-million-year-old jawbone ascribed to H. habilis and a 1.55-million-year-old skull belonging to H. erectus have been found east of Lake Turkana. These fossils suggest that H. habilis and H. erectus coexisted at this location for a time. Oldowan tools have been discovered near Lake Turkana as well, in sediments estimated to be 2.34 million years old; Acheulean tools appear by 1.65 mya.

Replica of KNM-ER 1470, a reconstructed Homo habilis skull found in 1972 at Koobi …

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